There have been covers of people taking a pre-recorded segment of a game (say, a 1v1 fight), and improvising a jazz score around it. How awesome would it be to

There have been covers of people taking a pre-recorded segment of a game (say, a 1v1 fight), and improvising a jazz score around it. How awesome would it be to have this happen live for any game? Anything from mood to specific sound effects.